Thermohydrometer



-sept 22,1936.v Y Hw. EDEN, :2,054,969

'THERMOHYDROMETER Filed Allg. 24,l 1935 2 Sheets-Sheet l K* i A Sept. 22, 1936.v H, W, EDEN I i 2,054,969- n -THERMOHYDOMETER Filed Ag. 24, 1935 v 2 Sheets-Sheet 2 Patented Sept. 22, 1936 UNITED STATES PATENT oFFlcE 2,054,969 THERM(HyDRoME'rER.

Harold W. Eden, chicago, lll., assigntr'to Triple- A- Specialty Company, a corporation of Illinois Y Application ,Augustana 1935,k serial N0. 37,778

u. s claims. (crass- 46) Thisl invention relates to thermohydrometers adapted to indicate simultaneously thel tempera-r The primary object ofV the invention is to provide an accurate and inexpensive device., which may be cleaned easily vand will enable v` the user to determine'` ther safetemperature to which the solution maybe subjected-Without freezing. In order to accomplish this it is necessary to read with a reasonable 'degree otl accu- V racy both the temperature andspecic gravity of a liquid and by applying' these to anassociated correction table the safe temperature `may be obtained for various anti-freeze solutions.

The present application is a continuationin part of my application, Serial No.' 760,013, led gopDecember 31, 1934, for a Thermohydrometer.

Heretofore thermohydrometers have been provided With a fixed thermometer havingits bulb xed in a liquid chamber disposed beneath the housing barrel and exposed to` the hot liquid 25; before it reaches theY chamber in which the hydrometer-cat operates. This. arrangementhas proven unsatisfactory for careful tests have shown that sometimes'therej is a-,difference of as much as 35 in temperature between the liquids 30t in two chambers, due to the fact thatthe lower necessary to use mercury instead of spirits in thevthermometer as the quick acting spirit thermometer could not be subjected to the heat necessary in building the rest ofl thel float. 451-: Another objection was that the readings on the thermometer were so small that readings could.

only be made with Vgreat difculty.

In the present invention the *non-'buoyant thermometer member'is loosely enclosed in the 50..same glass chamberv that houses the floatV and readings may be made easily as the thermometer scale is large and close tothe transparent Wall of the chamber. While the liquidmay; cool in the barrel slightly while passing from lthe thermvmeief. i0 the mamme-differential is notas@ It has also` been proposed, loere-V great with the present arrangement and may be compensated for ian-the indicated readings of the thermometer. Also, in automobiles, the radiator liquid is usually so cloudy that the thermometer cannot be read until the barrel is :il drained. This is an advantage with the present invention as more time is available for the spirits in the thermometer to act. Obviously, the thermometer is irst subjected to the hottest liquid which will bring it up to temperature quickly, 10r

anv elevational View of a thermo- Fig. 2,

an enlarged broken sectional View of the nozzle V head; Fig. 3, a broken elevational View showing a modied form of hose connected to a nozzle head; Fig. 4, a Vdiagrammatic view of a modern radiator showing how the improved hose may be inserted therein; Fig. 5, a broken sectional view showing the lower portion of a modied form of thermohydrometer; Fig-6, a top plan ViewY of, the modied thermometer tube cap shown in Fig- 5; and Fig. 7, a bottom plan view ofthe cap shown in Fig. 6.

Rreferrin'grst to the form shown in Figs. 1 and 2y ofthe drawings, V A designates a transparent housing barrely-B, a nozzle-head for the lowerlend of said barrel; C, a bulb for drawing liquid into the barrel through said nozzlehead; 35` D, a non-floating thermomete-r-member; and E,

a conventional hydrometer-float.

:The housing barrel is of the conventional construction and preferably of glass, having a cylindrical `lower portion Il)V and a pear-shaped upper portion ll. I

The nozzle head B shown in Fig. `1 is ,alsoI of the conventional construction and may corn-V prise an apertured plug I2 adapted to engage the end of the member A, and has a long com- 415 municating tubular portion i3 which may be inserted into the liquid to be tested. The head may beA provided with an aperture ld into which the thermometer bulb may extend while the unitis supported on shoulders l5. Suitable cutaway 50.

towards the top ofthe aperture I4., Y

The syringe-bulb C is of the conventional construction and is adapted to iit snugly over the end of the barrel A. It is shown provided with outwardly projecting ears l'I to prevent the instrument from rolling off an inclined surface.

The thermometer member D may comprise an open bottom transparent tube I8, preferably of glass, in which may be placed a scale I9. The

tube i8 is shown with glassrcollar at its lowerY end. A plug 2E! fits snugly into the bottom of the barrel and is perforated to receive the capillary tube 2l which communicates with the bulb 22 and contains colored spirits 23, or the like.

As the thermometer-member holds the hydrometer-float E in spaced relation fromthe nozzlehead B it is provided at its upper end Vwith a cushion which may be in the form of a resilient cap 24.

The hydrometer-oat E is of the conventional type having a weighted base portion 25 and a carefully calibrated scale 26 at its upper portion.

The operation of the device is obvious and it will be understood that when the liquid is drawn into the housing barrel A by means of the bulb C the thermometer-member will remain in the lower portion of the barrel while the hydrometer-float will gradually risel and indicate the specific gravity, by the level of the liquid on the scale 26. 1

Referring now to the modifications shown in Figs. 3 7, it will be seen that a hydrometer barrel A may be provided with a nozzle-head B' which encircles and forms a lower closure for the barrel. The perforated nozzle-head is provided with a long resilient communicating hose 2 which normally has a curved set, as shown in Fig. 3. This curved set Vmay be obtained by allowing the tubing to remain on a small reel for a considerable length of time. The lower end of the hose is cut at an angle, as shown at 28, so as to taper to a point on the concave side of the hose. As illustrated in Fig. 4, many ofthe modern automobile radiators have a cap beneath the hood of the car and the radiator is provided with a channel-like bailleV plate 29 to prevent surging the liquid when the car goes around a corner. The baiile plate is provided in its central portion with a perforation 30 which is usually about three-fourths of an inch in diameter. This arrangement makes it extremely dimcult to thread the ordinary type of hose ydown into the liquid, but with the present invention the hose is fed into the radiator with the concave side downwardly and the point 28 will easily follow the channel and be projected down through the opening 30 by the hosetaking an as illustrated in Fig. 4.

The thermometer tube illustrated inA Fig. 5 is similar to that shown in Fig. 1 but is provided with a perforated plug 3l which has downwardly and outwardly extending resilient legs 32 which partially enclose and protect the thermometer bulb 33 and encircle the top opening 34 of the hose 21. By this arrangement Vthe bulb is protected while being handled and when placed in operative position the legs distribute the incoming liquid around the bulb without formation of any air pockets. The legs also serve as spacers for centering the non-buoyant thermometer in the lower-end of the barrel A' and permit a hot liquid to freely well up around the thermometer to the hydrometer-oat E'. The modied cap illustrated in Figs. 5-7 is provided with three upwardly extending ribs 35 and an open bottom hood36 for snugly receiving the moved and wiped off without diiculty.

though the thermometer bulb 33 is asV thin as top of the thermometer tube. The hood is further provided with an upwardly presented open cup 3'1 to loosely receive and center the lower end of a oat E'. This arrangement insures all sides of the float to be moistened uniformly by the incoming liquid and forms a cushion to prevent breakage of the float when lowered quickly in the barrel.

It will be readily understood that to clean the device it ismerely necessary to remove the head B' and the thermometer and float may be re- Altissuepaper, the legs 32 effectively guard the same against breakage and enable the thermometer to Ybe handled without great care.

V'The foregoing vdetailed description has been given for clearn'ess of understanding only, and novunnecessary limitations should be understood therefrom,'but the appended claims should be construed as broadly as permissible, in view of the prior art. n Y i l I claim:

1. A thermohydrometer comprising:v a trans-V parent housing barrel having aYnozZle-head de-v 2. A thermohydrometer comprising: 1a glass-V housing member having at its lower end a rubber nozzle-head and at its upper end a rubber bulb adapted to draw liquid into said housing-member through said nozzle-head; a non-buoyant thermometer-member in the lower portion of said housing comprising an open-bottom transparent tube, a scale in said tube, a plug in the lower porf tion of said tube provided with an aperture, and a thermometer having a bulb below said plug and a communicating capillary tube extending through said aperture into said tube; a resilient cap on the topof the open-bottom thermometer tube; and a hydrometer-oat in the housing with its downward travel limited by said cap.

3. A device as specified in claim 2, in which the nozzle-head is apertured to receive the thermometer bulb loosely and has shoulders upon which the bottomrof said tube may rest.V

4. A syringe hydrometer comprising: a transparent barrel; a suction bulb forming a top closure for saidV barrel; a liquid-contacting lower closure member for the barrel; a non-buoyant thermometer loosely enclosed by said barrel, said thermometer being provided on its lower end with resilient legsA partially enclosing the bulb of said thermometer and supporting the same on the lower closure member, and the top of said thermometer being provided with a resilient cap; and a loose specific gravity float in said barrel adapted to rest on said cap when in Yits lowermost position in said barrel.

5. A syringe hydrometer comprising:V a trans-V cap providing an upwardly presented cup and adapted to receive and center a float; and a loose specific gravity oat in said barrel adapted to rest in said cup when in its lowermost position in said barrel.

6. A syringe hydrometer comprising: a transparent barrel; a suction bulb forming a top closure for said barrel; a liquid-conducting lower closure member for the barrel; a non-buoyant thermometer loosely enclosed by said barrel comprising an open-bottom transparent tube, a scale in said tube, a. centrally perforated plug in the lower end of said tube having legs extending downwardly beyond the tube, and a capillary tube extending through said perforation and having a communicating spirit bulb depending from the plug between said legs; a resilient cap on the top of said barrel; and a loose specific gravity oat in said barrel adapted to rest on said cap when in its lowermost position in said barrel.

HAROLD W. EDEN. 

